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| Number | Title | Issue Date |
| 7303593 | Method to blend separator powders A method for making a blended powder mixture, whereby two or more powders are mixed in a container with a liquid selected from nitrogen or short-chain alcohols, where at least one of the powders has an angle of repose greater than approximately 50 degrees. The metho... | 12/04/2007 |
| 7014832 | Simultaneous recovery of potassium chloride and KCL enriched edible salt The present invention relates to recovery of industrial grade potassium chloride and low sodium edible salt from bittern as part of an integrated process. The process comprises, mixing low sulphate concentrated feed bittern (a by-product of salt industry) of density... | 03/21/2006 |
| 6986878 | Method of producing potassium sulfate via cation exchange A process for producing potassium sulfate from potash and sodium sulfate, which involves providing a source of sodium sulfate and passing the sodium sulfate through cationic exchanger. Eluted potassium sulfate containing sodium sulfate is reacted with potash to form... | 01/17/2006 |
| 6890509 | Process for recovery of low sodium salt from bittern A new process for recovery of Low Sodium Salt from bittern has been described in the present invention, the said process comprising desulphatation of bittern (by-product of salt industry), evaporation of bittern in solar pans and processing of solid mixture with wat... | 05/10/2005 |
| 6884269 | Continuous method for manufacture of uniform size flake or powder A method and apparatus for continuous fabrication of homogeneous thin flake or powder electrolyte material from inorganic salt, metallic or similar materials or from mixtures of such materials for use in Carbonate Fuel Cell (“CFC”) power plants. Electrolyte prec... | 04/26/2005 |
| 6846417 | Co-retarding agents for preparing purified brine The invention relates to a process to produce brine of improved purity by dissolving salt that contains a calcium sulfate source in water, in the presence of a retarding agent, while using one or more co-retardants to bind contaminants that could interfere with the ... | 01/25/2005 |
| 6660049 | Process for control of crystallization of inorganics from aqueous solutions Process of crystallization of sodium bicarbonate from solution mined Nahcolite pregnant liquor comprising the use of from about 2 to 100 parts per million of lecithin, introduced full strength, made miscible in water with a soap or detergent, saponified w... | 12/09/2003 |
| 6547836 | Process for obtaining monohydrated lithium sulfate from natural brines A process for obtaining monochlorated lithium sulfate from natural brines by mixing two brines: one saturated or nearly saturated with silvite (KCl), carnallite (KCl, MgCl2.6H.sub.2 O), and lithium sulfate (Li2 SO4.H.sub.2... | 04/15/2003 |
| 6464736 | Recrystallization process The present invention provides a process for producing crystals of a polymorphic compound in a first crystal structure by introduction of the compound in a second crystal structure into a saturated brine solution of the compound under conditions in which ... | 10/15/2002 |
| 6340373 | Process for recovering and treating of aqueous solutions There is described a method for the treatment and processing of solutions of an organic fluid, water and one or more compounds of alkaline earth metals, alkali metals and metal ions, comprising the following steps: a) conducting a stream (5) consisting of... | 01/22/2002 |
| 6334878 | Apparatus and method for crystallization An apparatus for crystallization, which contains a crystallization vessel, a seed supplying device, a feed solution supplying device and a tube baffle disposed within the crystallization vessel. The tube baffle is provided with a crystallization portion i... | 01/01/2002 |
| 6143271 | Process for producing potassium sulfate from potash and sodium sulfate The present invention provides a process for producing potassium sulfate from a potash and a sodium sulfate source, comprising the steps of: (a) treating a portion of the potash source and sodium sulfate source, such that glaserite is crystallized out of ... | 11/07/2000 |
| 6126702 | Apparatus and method for treating sesquisulfate waste streams The specification discloses an apparatus and method for treating a slurry containing sodium sesquisulfate to recover sulfate and acid constituents therefrom. The apparatus includes a treatment vessel having a separation wall delineating a clarifying zone ... | 10/03/2000 |
| 6099595 | Process for the preparation of crystalline sodium silicates The invention relates to a process for the preparation of crystalline sodium silicates having a sheet structure and high δ phase content from water glass, which has been prepared hydrothermally, by dehydration of the water glass and subsequent crystalliz... | 08/08/2000 |
| 6036733 | Process for the preparation of crystalline sodium silicates The invention relates to a process for the preparation of crystalline sodium silicates having a sheet structure and high δ phase content from water glass, which has been prepared predominantly hydrothermally, by dehydration of the water glass and subsequ... | 03/14/2000 |
| 5993759 | Production of lithium carbonate from brines Lithium carbonate can be efficiently produced from a brine by (i) removing the boron therefrom, (ii) diluting the boron-free brine, (iii) removing magnesium from the diluted brine, and (iv) adding sodium carbonate to thereby precipitate lithium carbonate.... | 11/30/1999 |
| 5906660 | Process for the manufacture of persalt particles Continuous process for the manufacture of solid particles of alkali metal persalts by reaction of an aqueous hydrogen peroxide solution with an aqueous solution of an alkali metal salt and crystallization of the persalt formed in a crystallizer-classifier... | 05/25/1999 |
| 5895523 | Process for making basic alkali metal sulfate pigments A process is provided for making K2 SO4 3Al2 O3 4S03 +xH2 O or Na2 SO4 3Al2 O3 4SO3 +xH2 O where x is a number from 4 to 12, whi... | 04/20/1999 |
| 5871551 | Process for the preparation of anhydrous sodium sulfate A process for the preparation of anhydrous sodium from a thenardite ore containing sodium sulfate comprising the steps of: crushing the thenardite ore; lixiviating the crushed ore in a first lixiviation step with water or with an exhausted solution from a... | 02/16/1999 |
| 5871571 | Inks and UV-opaque protectorants comprising basic sodium and/or sodium/potassium aluminum sulfates and process for making such commercial products A process for making ink which begins with a leach liquor of Al2 (SO4)3 +K2 SO4 +Fe2 SO4 and other sulfates that are introduced to a surface-cooled crystallizer that drops the Al... | 02/16/1999 |
| 5846501 | Process for the selective recovery of the salt constituents from used hardening shop salts which contain nitrite-nitrate In order to recover in an environmentally sound and economic manner used hardening shop salts which contain nitrate-nitrite, the salts, comminuted to particle sizes of from 1 to 50 mm, are dissolved in a mixture of nitric acid and hydrogen peroxide withou... | 12/08/1998 |
| 5840085 | Process for removing sodium chloride and potassium salts from ash collected from a soda recovery boiler This invention relates to a process for removing sodium chloride and potassium salts, which are impurities concentrated and accumulated in pulp digesting chemicals, from ash collected from a soda recovery boiler. This process comprises the steps of (a) mi... | 11/24/1998 |
| 5769906 | Process for recovering the salt constituents from hardening-shop salt baths The process for environmentally acceptable and economical recovery of chloride salts from hardening-shop used salts utilizing the steps of leaching of the used salt, detoxification of the cyanide and selective crystallization of the individual chloride sa... | 06/23/1998 |
| 5716419 | Process for crystallization of mineral salts Mineral salts, e.g., potassium chloride, are crystallized from aqueous solutions thereof in the presence of a crystal growth promoting amount of lecithin or lecithin containing compositions. Mineral salts include alkali metal and alkaline-earth metal chlo... | 02/10/1998 |
| 5690701 | Process for the manufacture of particles of coated persalts Continuous process for the manufacture of solid alkali metal persalt particles coated by crystallization of a supersaturated aqueous solution of persalts and covering of the persalt particles in a post-crystallization vessel into which at least one coatin... | 11/25/1997 |
| 5674617 | Granulated alkali metal cyanide New alkali metal cyanide granulates based on sodium cyanide or potassium cyanide and a method for their preparation are disclosed. Commercially available alkali metal cyanide granulates consist of irregular particles; disadvantages are in particular the t... | 10/07/1997 |
| 5651796 | Method for producing low bulk density hollow fine powder of alkali metal compound A low bulk density hollow fine powder of alkali metal compound can be produced from an aqueous solution of the compound by one step. The method for producing a low bulk density hollow fine powder of alkali metal compound according to the present invention... | 07/29/1997 |
| 5503641 | Process and apparatus for preparing a potassium chloride mixture A potassium chloride mixture with grains of different sizes is extracted in a first stage with an unsaturated solution at an elevated temperature, whereby the finest grains are completely dissolved and the coarse proportions are caused to start dissolutio... | 04/02/1996 |
| 5466266 | Closed system multistage superpurification recrystallization A method and apparatus are provided for superpurifying crystallizable substances to a purity level of 99.999%. Included is a closed multistage system which maintains controlled transfers of material between a plurality of stages. The method and apparatus ... | 11/14/1995 |
| 5449506 | Process for producing potassium carbonate A method for producing potassium carbonate using a continuous countercurrent exchange system. A continuous ion exchange system with resin in the ammonium form is flushed with a saturated potassium chloride solution which displaces the ammonium ion and rep... | 09/12/1995 |
| 5445805 | Large potassium bicarbonate crystals and process for the preparation thereof A large size, small surface area, granular crystalline potassium bicarbonate product suitable for application as an active ingredient in pharmaceutical oral unit dosage forms useful for the treatment of various degenerative bone and cardiovascular disease... | 08/29/1995 |
| 5382265 | Perchlorate removal process A process for removing perchlorate ion from waste water using KCl is disclosed. In the process, waste perchlorate is concentrated by water evaporation in a stripping tower. Ammonia and volatile organics are removed during the concentrating step. Potassium... | 01/17/1995 |
| 5330544 | Process and apparatus for increasing the size of ammonium sulfate crystals The average size of ammonium sulfate crystals is increased by passing undersized ammonium sulfate crystals through a multistage apparatus in which the crystals are contacted with an aqueous ammonium sulfate spray in a first heated chamber to increase the ... | 07/19/1994 |
| 5300123 | Method of reforming soluble salts to effect purification and increase crystal size thereof A method of reducing soluble and insoluble impurity levels while increasing the size of water soluble salt crystals which includes an initial step of fine grinding followed by regrowth in a saturated solution of the salt subjected to agitation.... | 04/05/1994 |
| 5240467 | Multistage countercurrent recrystallization process and apparatus for performing same A multistage process for the separation and purification of a desired crystalline material by repeated dissolution and recrystallization, wherein crystals and solvent move countercurrent to one another through the stages. A fluid temperature gradient is m... | 08/31/1993 |
| 5211922 | Process for the recovery of values from secondary aluminum dross A process for recovery of metallic aluminum, sodium and potassium chloride and an aluminum oxide-metallic aluminum product from secondary aluminum dross. A secondary aluminum dross feed is separated by particle size into a first dross portion which is wat... | 05/18/1993 |
| 5198200 | Process for the recovery of values from secondary aluminum dross A process for the recovery of metallic aluminum, mixtures of salts, and an aluminum oxide-metallic aluminum product from secondary aluminum dross. The process includes treating the dross with leach water to dissolve the salt content. Magnesium chloride is... | 03/30/1993 |
| 5126019 | Purification of chlor-alkali membrane cell brine This invention relates to methods and systems for purifying brine for electrolysis in chlor-alkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesireable ions s... | 06/30/1992 |
| 5124265 | Method and apparatus for crystallization process control A crystallizer control method and apparatus that generate control signals to manipulated process parameters on the basis of on-line information derived from the measurement of the crystal population in a selected size range in the crystallizer slurry. Acc... | 06/23/1992 |
| 5123997 | Plenum type crystal growth process Crystals are grown in a tank which is divided by a baffle into a crystal growth region above the baffle and a plenum region below the baffle. A turbine blade or stirring wheel is positioned in a turbine tube which extends through the baffle to generate a ... | 06/23/1992 |
